Drive circuit and drive method thereof, and panel and drive method thereof

ABSTRACT

A drive circuit and its drive method, and a panel and its drive method are provided. The drive circuit includes a step-up unit, a plurality of signal input terminals and a signal output terminal, which are electrically connected with each other. The step-up unit includes a first module, a second module, a third module and a first capacitor, which are electrically connected with each other. The first module is configured to transmit a signal of a third signal input terminal to a first electrode of the first capacitor. The second module is configured to transmit a signal of a fourth signal input terminal to a second electrode of the first capacitor. The third module is configured to transmit a signal of the third signal input terminal to the second electrode of the first capacitor, which further increases the signal of the first electrode of the first capacitor.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority of Chinese Patent Application No. 201910273124.X, filed on Apr. 4, 2019, the content of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure generally relates to the field of drive technology and, more particularly, relates to a drive circuit and its drive method, and a panel and its drive method.

BACKGROUND

Microfluidic technology is an emerging technology with a broad range of application prospects in the fields of biology, chemistry, medicine, etc. Microfluidic chips are the main platforms for implementing microfluidic technology. The basic operation units such as sample preparation, reaction, separation and detection of biological, chemical and medical analysis processes may be integrated into a micro-scale microfluidic chip, and the complete analysis process may be automatically implemented on the microfluidic chip. Based on the dielectric electrowetting effect, continuous liquid may be discretized by an external driving force to manipulate and analyze micro-scale formed liquid droplets on a digital two-dimensional microfluidic chip, where the real-time accurate detection of the micro-scale liquid droplets may have a great significance on subsequent programmed experiments and reaction results. Different regions on the microfluidic chip may have different functions, such as mixing, splitting, heating, testing, etc. As the smallest operation unit on the chip, the issues such as real-time, cross-contamination, breakdown may need to be considered when designing the liquid droplet moving path between different regions. The manual arrangement of the liquid droplet moving path may have a large workload, which may not meet the original objective of developing the on-chip laboratory. However, using the programmability of the dielectric electrowetting technique, combined with computer algorithms and integrated circuit layout designs, to automatically design the liquid droplet moving path may be a promising solution.

In the conventional technology, the microfluidic devices may include control circuits and drive electrodes. The control circuits may be configured to supply voltage to the drive electrodes, so an electric field may be formed between adjacent drive electrodes, and the liquid droplets may move under the driving force of the electric field. Passive drive chips may be used in control circuits. However, the driving ability of the passive drive chips may be limited, and a large number of the drive electrodes may be required when large-scale chemical micro-reactions or substance detections are needed simultaneously. In order to provide signals to the large number of the drive electrodes, the drive chips may need a large number of signal channels (pins), which may not be supported by current passive drive chips.

In the conventional technology, the signal channels of the drive chips may be reduced by configuring the drive electrodes and control circuits in an array, and the drive chips used may be the active drive chips. However, in the conventional technology, the drive voltage outputted by the active drive chips may be different from the voltage that may drive the liquid droplets to move. The voltage for driving the liquid droplets to move may be about 50 V. According to the drive voltage of the active drive chips in the conventional technology, the high-voltage drive chips may only provide a drive voltage of about 30 V, so the existing active drive chips may have a problem of insufficient drive voltage.

Therefore, how to improve the microfluidic devices to implement large-scale sample detections and reactions may be a technical problem to be solved in the microfluidic field.

SUMMARY

One aspect of the present disclosure provides a drive circuit. The drive circuit includes a step-up unit, a plurality of signal input terminals and a signal output terminal, electrically connected with each other, where the step-up unit includes a first module, a second module, a third module and a first capacitor, electrically connected with each other; the plurality of signal input terminals includes a first signal input terminal, a second signal input terminal, a third signal input terminal and a fourth signal input terminal; the first module is electrically connected to each of the first signal input terminal, the third signal input terminal, and a first electrode of the first capacitor; and the first module is configured to transmit a signal of the third signal input terminal to the first electrode of the first capacitor; the second module is electrically connected to each of a second electrode of the first capacitor, the first signal input terminal and the fourth signal input terminal; and the second module is configured to transmit a signal of the fourth signal input terminal to the second electrode of the first capacitor; the third module is electrically connected to each of the second signal input terminal, the third signal input terminal and the second electrode of the first capacitor; and the third module is configured to transmit the signal of the third signal input terminal to the second electrode of the first capacitor to further increase the signal of the first electrode of the first capacitor; and the first electrode of the first capacitor is electrically connected to the signal output terminal to output a high potential signal.

Another aspect of the present disclosure provides a drive method of a drive circuit configured to drive the drive circuit. The drive method includes: a first phase, where a potential signal of the third signal input terminal is transmitted to the first electrode of the first capacitor through the first module, and a potential signal of the fourth signal input terminal is transmitted to the second electrode of the first capacitor through the second module, thereby generating a voltage difference between two electrodes of the first capacitor; a second phase, where the potential signal of the third signal input terminal is transmitted to the second electrode of the first capacitor through the third module, thereby increasing the potential signal of the first electrode of the first capacitor; and a third phase, where the increased potential signal maintained by the first electrode of the first capacitor is outputted through the signal output terminal.

Another aspect of the present disclosure provides a panel. The panel includes: a substrate, an array layer and an electrode array layer, where the array layer is on a side of the substrate; the electrode array layer is on a side of the array layer away from the substrate; and the array layer includes an active layer, a gate metal layer and a source/drain metal layer; the substrate includes a plurality of drive units arranged in an array, a plurality of scan line groups, a plurality of data lines extending in a second direction; and a plurality of common signal lines extending in the second direction; the scan line group includes first scan lines and second scan lines adjacent to the first scan lines, extending in a first direction; where the first direction is perpendicular with the second direction; the electrode array layer includes a plurality of drive electrodes arranged in an array; the drive electrodes correspond to the drive units; and the drive unit includes a first transistor, a second transistor, a third transistor, a first capacitor and a second capacitor; a gate of the first transistor is electrically connected to the first scan line; a source of the first transistor is electrically connected to the data line; and a drain of the first transistor is electrically connected to the drive electrode; a gate of the second transistor is electrically connected to the first scan line; a source of the second transistor is electrically connected to the common signal line; and a drain of the second transistor is electrically connected to a first electrode of the second capacitor; a gate of the third transistor is electrically connected to the second scan line; a source of the third transistor is electrically connected to the data line; and a drain of the third transistor is electrically connected to the first electrode of the second capacitor; a first electrode of the first capacitor is electrically connected to the drive electrode, and a second electrode of the first capacitor is electrically connected to the first electrode of the second capacitor; and a second electrode of the second capacitor is electrically connected to the common signal line.

Another aspect of the present disclosure provides a drive method of a panel. The panel according to the embodiments in the present disclosure includes a plurality of drive units arranged in an array. The drive method includes forming an electric field between adjacent drive electrodes on the panel by modifying potential signals received from the data line of two adjacent drive units, where the panel includes a first drive unit and a second drive unit, which are adjacent to each other, arranged in the first direction sequentially; the electric field is formed between the first drive unit and the second drive unit; for the first drive unit and the second drive, the first scan line is configured to receive an enable signal and the second scan line is not configured to receive the enable signal, which makes the first transistor and the second transistor to be conducting, and the third transistor to be cutoff; a low potential signal is transmitted to the data line of the first drive unit, a high potential signal is transmitted to the data line of the second drive unit, a low potential signal is transmitted to the common signal line of the first drive unit, and a low potential signal is transmitted to the common signal line of the second drive unit, which makes the potential of the first electrode of the first capacitor of the first drive unit to be the low potential signal, makes the potential of the second electrode of the first capacitor of the first drive unit to be the low potential signal, makes the potential of the first electrode of the first capacitor of the second drive unit to be the high potential signal, and makes the potential of the second electrode of the first capacitor of the second drive unit to be the high potential signal; such that the potential of the drive electrode of the first drive unit is lower than the potential of the drive electrode of the second drive unit; and for the first drive unit and the second drive unit, the first scan line disconnects the enable signal and the second scan line receives the second enable signal, which makes the first transistor and the second transistor to be cutoff and makes the third transistor to be conducting; the low potential signal continues to be transmitted to the data line of the first drive unit, and the high potential signal continues to be transmitted to the data line of the second drive unit, which makes the potential of the first electrode of the first capacitor of the second drive unit to be further increased; such that the potential of the drive electrode of the first drive unit is further lower than the potential of the drive electrode of the second drive unit.

Other aspects of the present disclosure can be understood by those skilled in the art in light of the description, the claims, and the drawings of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The following drawings are merely examples for illustrative purposes according to various disclosed embodiments and are not intended to limit the scope of the present disclosure. Drawings incorporated in the specification and forming part of the specification demonstrate embodiments of the present disclosure and, together with the specification, describe the principles of the present disclosure.

FIG. 1 illustrates a structural schematic of an exemplary drive circuit according to embodiments of the present disclosure;

FIG. 2 illustrates a structural schematic of another exemplary drive circuit according to embodiments of the present disclosure;

FIG. 3 illustrates a drive sequence schematic corresponding to a high potential signal output by the drive circuit provided in FIG. 2;

FIG. 4 illustrates a simulation circuit schematic corresponding to FIG. 2;

FIG. 5 illustrates a simulation result schematic implemented by the drive sequence of FIG. 3 and the simulation circuit of FIG. 4;

FIG. 6 illustrates a drive sequence schematic corresponding to a low potential signal output by the drive circuit provided in FIG. 2;

FIG. 7 illustrates a simulation result schematic implemented by the drive sequence of FIG. 6 and the simulation circuit of FIG. 4;

FIG. 8 illustrates a structural schematic of another exemplary drive circuit according to embodiments of the present disclosure;

FIG. 9 illustrates a structural schematic of another exemplary drive circuit according to embodiments of the present disclosure;

FIG. 10 illustrates a structural schematic of another exemplary drive circuit according to embodiments of the present disclosure;

FIG. 11 illustrates a structural schematic of another exemplary drive circuit according to embodiments of the present disclosure;

FIG. 12 illustrates a work flowchart of a drive method of a drive circuit according embodiments of the present disclosure;

FIG. 13 illustrates another work flowchart of a drive method of a drive circuit according embodiments of the present disclosure;

FIG. 14 illustrates a top-view structural schematic of a panel according embodiments of the present disclosure;

FIG. 15 illustrates a cross-sectional structural schematic along a A-A′ direction in FIG. 14;

FIG. 16 illustrates another cross-sectional structural schematic along a B-B′ direction in FIG. 14;

FIG. 17 illustrates a top-view structural schematic of a panel according embodiments of the present disclosure;

FIG. 18 illustrates another top-view structural schematic of a panel according embodiments of the present disclosure;

FIG. 19 illustrates another top-view structural schematic of a panel according embodiments of the present disclosure;

FIG. 20 illustrates a drive sequence schematic corresponding to a first drive unit in FIG. 19;

FIG. 21 illustrates a drive sequence schematic corresponding to a second drive unit in FIG. 19;

FIG. 22 illustrates a cross-sectional structural schematic along a C-C′ direction in FIG. 19; and

FIG. 23 illustrates a principle structural schematic of confirming positions of a first drive unit and a second drive unit according embodiments of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to exemplary embodiments of the disclosure, which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Various exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the present disclosure unless otherwise specified.

The following description of at least one exemplary embodiment is merely illustrative, and not as any limitations on the present disclosure and its application or use.

Techniques, methods and instruments known to those skilled in the art may not be discussed in detail, but where appropriate, the techniques, methods and instruments should be considered as part of the specification.

In all of the examples illustrated and discussed herein, any specific values should be construed as merely illustrative, and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in a figure, it is not required to be further discussed in the subsequent figures.

Referring to FIG. 1, FIG. 1 illustrates a structural schematic of an exemplary drive circuit according to embodiments of the present disclosure. A drive circuit provided in one embodiment may include a step-up unit 10, a plurality of signal input terminals 20, and a signal output terminal 30, which may be electrically connected with each other. The step-up unit 10 may include a first module 101, a second module 102, a third module 103 and a first capacitor C1, which are electrically connected with each other. The plurality of signal input terminals 20 may include a first signal input terminal 201, a second signal input terminal 202, a third signal input terminal 203 and a fourth signal input terminal 204.

The first module 101 may be electrically connected to each of the first signal input terminal 201, the third signal input terminal 203 and a first electrode of the first capacitor C1. The first module 101 may be configured to transmit a signal of the third signal input terminal 203 to the first electrode of the first capacitor C1.

The second module 102 may be electrically connected to each of a second electrode of the first capacitor C1, the first signal input terminal 201 and the fourth signal input terminal 204. The second module 102 may be configured to transmit a signal of the fourth input terminal 204 to the second electrode of the first capacitor C1.

The third module 103 may be electrically connected to each of the second signal input terminal 202, the third signal input terminal 203 and the second electrode of the first capacitor C1. The third module 103 may be configured to transmit a signal of the third signal input terminal 203 to the second electrode of the first capacitor C1, which may further increase the signal of the first electrode of the first capacitor C1.

The first electrode of the first capacitor C1 may be electrically connected to the signal output terminal 30, which may be configured to output a high potential signal.

For example, the drive circuit provided by the present disclosure may transmit the signal of the third signal input terminal 203 to the first electrode of the first capacitor C1 through the first module 101, and may transmit the signal of the fourth signal input terminal 204 to the second electrode of the first capacitor C1 through the second module 102, thereby generating a voltage difference between the first electrode and the second electrode of the first capacitor C1. Then, the signal of the third signal input terminal 203 may be transmitted to the second electrode of the first capacitor C1 through the second module 103. Currently, the first module 101 may not operate, and the first capacitor C1 may be subject to a coupling effect where a voltage difference between two electrodes of the first capacitor C1 may remain unchanged; and the signal of the third signal input terminal 203 may be transmitted to the second electrode of the first capacitor C1 through the third module 103. Therefore, the signal of the first electrode of the first capacitor C1 may be further increased. In one embodiment, the conduction and turn-off of the first module 101, the second module 102 and the third module 103 may be controlled at different time periods. Therefore, after forming the voltage difference between the first electrode and the second electrode of the first capacitor C1, the potential signal of the first electrode of the first capacitor C1 may be further increased to obtain a higher potential signal, thereby implementing the function of low voltage input and high voltage output of the drive circuit, which may be advantageous to implement the step-up drive circuit. Moreover, the drive circuit provided in one embodiment may be applied to a microfluidic device, and the drive chip providing the drive signal may not need to be configured with a large number of signal channels when the microfluidic device needs a large number of drive electrodes to simultaneously perform chemical micro-reactions or substance detections of large sample quantities, which may be advantageous to reduce the computational difficulty of the drive chip, and to provide a sufficient high drive voltage for the liquid droplets to move normally.

It should be noted that the structures of the first module 101, the second module 102 and the third module 103 may not be limited in one embodiment. The structure of each module may be designed according to actual situations in an implementation and may only be needed to realize the step-up function of the drive circuit.

In some embodiments, referring to FIG. 2 and FIG. 3, FIG. 2 illustrates a structural schematic of an exemplary drive circuit according to embodiments of the present disclosure. FIG. 3 illustrates a drive sequence schematic corresponding to a high potential signal output by the drive circuit provided in FIG. 2.

In one embodiment, the first module 101 may include a first transistor T1. A gate of the first transistor T1 may be electrically connected to the first signal input terminal 201. A first electrode of the first transistor T1 may be electrically connected to the third signal input terminal 203, and a second electrode of the first transistor T1 may be electrically connected to the first electrode of the first capacitor C1.

The second module 102 may include a second transistor T2. A gate of the second transistor T2 may be electrically connected to the first signal input terminal 201. A first electrode of the second transistor T2 may be electrically connected to the second electrode of the first capacitor C1, and a second electrode of the second transistor T2 may be electrically connected to the fourth signal input terminal 204.

The third module 103 may include a third transistor T3. A gate of the third transistor T3 may be electrically connected to the second signal input terminal 202. A first electrode of the third transistor T3 may be electrically connected to the second electrode of the first capacitor C1, and a second electrode of the third transistor T3 may be electrically connected to the third signal input terminal 203.

A first node N1 may be configured between the second electrode of the first transistor T1 and the first electrode of the first capacitor C1. A second node N2 may be configured between the second electrode of the first capacitor C1 and the first electrode of the second transistor T2. The first node N1 may be electrically connected to the signal output terminal 30.

In one embodiment, it may further describe the structures and the electrical connection relationship of the first module 101, the second module 102 and the third module 103. The first module 101 may include the first transistor T1, the second module 102 may include the second transistor T2, and the third module 103 may include the third transistor T3. For the operation of the drive circuit in one embodiment, refer to FIGS. 2-5. The first transistor T1, the second transistor T2 and the third transistor T3, which all are N-type switch transistors, may be used in FIG. 3 for description. FIG. 4 illustrates a simulation circuit schematic corresponding to FIG. 2. In FIG. 4, M1 may correspond to the first transistor T1 in FIG. 2; M2 may correspond to the second transistor T2 in FIG. 2; M3 may correspond to the third transistor T3 in FIG. 2; C1 may correspond to the first capacitor C1 in FIG. 2; P may correspond to the first node N1 in FIG. 2; boost may correspond to the second node N2 in FIG. 2; g1 may correspond to the first signal input terminal 201 in FIG. 2; g2 may correspond to the second signal input terminal 202 in FIG. 2; sd may correspond to the third signal input terminal 203 in FIG. 2; and vcom may correspond to the fourth input terminal 204 in FIG. 2. FIG. 5 illustrates a simulation result schematic implemented by the drive sequence of FIG. 3 and the simulation circuit of FIG. 4. It should be noted that, in order to facilitate the simulation, an overtime treatment may be performed on sd having supplied signals in FIG. 5. It can be understood that the working phase of sd may be only the phase that g1 and g2 have supplied signals.

In a first time period t1, the first signal input terminal 201 may input a high potential and the second signal input terminal 202 may input a low potential signal, so both the first transistor T1 and the second transistor T2 may be conducting, and the third transistor T3 may be cutoff. A potential signal A of the third signal input terminal 203 may be transmitted to the first node N1 through the first transistor T1, and a potential signal B of the fourth signal input terminal 204 may be transmitted to the second node N2 through the second transistor T2, where A may be greater than B. The voltage difference between the two electrodes of the first capacitor C1 may be a difference (A−B) between the potential of the first node N1 and the potential of the second node N2.

In a second time period t2, the first signal input terminal 201 may input a low potential signal, and the second signal input terminal 202 may input a high potential signal, so the first transistor T1 and the second transistor T2 may be both cutoff, and the third transistor T3 may be conducting. The potential signal A of the third signal input terminal 203 may be transmitted to the second node N2 through the third transistor T3, so the potential of the second node N2 may be A. Currently, the first transistor T1 may be cutoff and the first capacitor C1 may be subject to the coupling effect, and the voltage difference between the two electrodes may remain unchanged, so the potential of the first node N1 may be increased to (A+(A−B))=(2A−B).

In a third time period t3, the increased potential (2A−B) maintained by the first electrode of the first capacitor C1 may be outputted through the signal output terminal 30.

In one embodiment, the function of low voltage input, high voltage or even higher voltage output of the drive circuit may be implemented through three above-mentioned working phases.

It should be noted that, in one embodiment, FIG. 3 is a drive sequence schematic that the first transistor T1, the second transistor T2 and the third transistor T3 may all be the N-type transistors. The N-type transistors may be conducting under the control of the high level signal and may be cutoff under the control of the low level signal. In some optional embodiments, the first transistor T1, the second transistor T2 and the third transistor T3 may all be the P-type transistors. The P-type transistors may be conducting under the control of the low level signal and may be cutoff under the control of the high level signal, so the corresponding drive sequence in one embodiment may change accordingly, and details may not be described herein.

In some optional embodiments, refer to FIG. 2, FIG. 6 and FIG. 7. FIG. 6 illustrates a drive sequence schematic corresponding to a low potential signal output by the drive circuit provided in FIG. 2. FIG. 7 illustrates a simulation result schematic implemented by the drive sequence of FIG. 6 and the simulation circuit of FIG. 4. It should be noted that, in order to facilitate the simulation, an overtime treatment may be performed on sd having supplied signals in FIG. 5. It can be understood that the working phase of sd may be only the phase that g1 and g2 have supplied signals. For example, in the first time period t1 and the second time period t2 in one embodiment, the first node N1 (i.e., the first electrode of the first capacitor C1) may continue to output the low potential signal when the third signal input terminal 203 transmits the low potential signal. It can be seen from the above-mentioned embodiments that the drive circuit of one embodiment may implement the function of low voltage input and high voltage output and the function of low voltage input and low voltage output by changing the drive sequence, and only the input signal of the third signal input terminal 203 may be required to be changed. In one embodiment, the circuit structure may be simple. When outputting different high or low potential signals, it may not be required to change the circuit structure and may be only required to adjust the drive sequence, which may be advantageous for the simplification development of the drive work.

In some optional embodiments, referring to FIG. 8, FIG. 8 illustrates a structural schematic of another exemplary drive circuit according to embodiments of the present disclosure. In one embodiment, the second module 102 may further include a fourth transistor T4. A gate of the fourth transistor T4 may be electrically connected to the gate of the second transistor T2. A first electrode of the fourth transistor T4 may be electrically connected to the second electrode of the second transistor T2, and a second electrode of the fourth transistor T4 may be electrically connected to the fourth signal input terminal 204.

The third module 103 may further include a fifth transistor T5. A gate of the fifth transistor T5 may be electrically connected to the gate of the third transistor T3. A first electrode of the fifth transistor T5 may be electrically connected to the second electrode of the third transistor T3, and a second electrode of the fifth transistor T5 may be electrically connected to the third signal input terminal 203.

In one embodiment, the second module 102 may be further configured to include the fourth transistor T4 and the third module 103 may be further configured to include the fifth transistor T5. After electrically connecting to the second transistor T2, the fourth transistor T4 may be electrically connected to the fourth signal input terminal 204. After electrically connecting to the third transistor T3, the fifth transistor T5 may be electrically connected to the third signal input terminal 203. In such way, the fourth transistor T4 and the second transistor T2, and the fifth transistor T5 and the third transistor T3 may respectively form a dual channel transistor structure. When the third signal input terminal 203 of the drive circuit supplies the potential signal to the second electrode of the first capacitor C1 through the fifth transistor T5 and the third transistor T3, a current flowing through the first electrode of the fifth transistor T5 is assumed as I, so a leakage current flowing through the gate of the fifth transistor T5 may be A % X I. When flowing through the gate of the third transistor T3, the leakage current may be A % X I X A %. If A takes a constant of 10, the leakage current flowing through the gate of the fifth transistor T5 may be 10% I. When flowing through the gate of the third transistor T3, the leakage current may be 10% X I X 10%=1% I. Compared with the gate with only one third transistor T3, the leakage current of the gate with the third transistor T3 and the fifth transistor T5 may be reduced by 9% I when transmitting to the second electrode of the first capacitor C1. Similarly, the fourth signal input terminal 204 may supply the potential signal to the second electrode of the first capacitor C1 through the fourth transistor T4 and the second transistor T2, which may reduce the leakage current correspondingly. In one embodiment, the second module 102 may be further configured to include the fourth transistor T4, and the third module 103 may be further configured to include the fifth transistor T5, which may reduce the leakage current and improve the stability of the output signal of the drive circuit.

In some optional embodiments, referring to FIG. 9, FIG. 9 illustrates a structural schematic of another exemplary drive circuit according to embodiments of the present disclosure. In one embodiment, the drive circuit may further include a voltage stabilizing unit 40. The voltage stabilizing unit 40 may be electrically connected to each of the fourth signal input terminal 204 and the two electrodes of the first capacitor C1. The voltage stabilizing unit 40 may be configured to respectively stabilize the potential signals of the two electrodes of the first capacitor C1.

In one embodiment, it may further describe that the drive circuit may further include the voltage stabilizing unit 40, and the voltage stabilizing unit 40 may be electrically connected to each of the fourth signal input terminal 204 and the two electrodes of the first capacitor C1. The voltage stabilizing unit 40 may be used to respectively stabilize the potential signals of the two electrodes of the first capacitor C1. In such way, after the potential signal of the first electrode of the first capacitor C1 is further increased, the potential signal may be inputted to the two electrodes of the first capacitor C1 through the fourth signal input terminal 204, so the first electrode of the first capacitor C1 may continue to maintain a high potential output, which may increase the high potential retention rate of the drive circuit.

In some optional embodiments, referring to FIG. 10, FIG. 10 illustrates a structural schematic of another exemplary drive circuit according to embodiments of the present disclosure. In one embodiment, the voltage stabilizing unit 40 may include a second capacitor C2. A first electrode of the second capacitor C2 may be electrically connected to the second electrode of the first capacitor C1, and a second electrode of the second capacitor C2 may be electrically connected to the fourth signal input terminal 204. The second capacitor C2 may be configured to stabilize the potential signal of the second electrode of the first capacitor C1.

In one embodiment, it may further describe that the structure of the voltage stabilizing unit 40 of the drive circuit may include the second capacitor C2. The first electrode of the second capacitor C2 may be electrically connected to the second electrode of the first capacitor C1, and the second electrode of the second capacitor C2 may be electrically connected to the fourth signal input terminal 204. The voltage stabilizing potential signal may be transmitted to the second electrode of the second capacitor C2 through the fourth signal input terminal 204. A certain potential difference may need to be maintained between the two electrodes of the second capacitor C2, so the first electrode of the second capacitor C2 (i.e., the second electrode of the first capacitor C1) may be maintained on the low potential signal for a period of time. In one embodiment, the second capacitor C2 may be configured to stabilize the low potential signal of the second electrode of the first capacitor C1, and signal distortion may be prevented by maintaining the stable low potential signal of the second electrode of the first capacitor C1 through the second capacitor C2.

In some optional embodiments, referring to FIG. 11, FIG. 11 illustrates a structural schematic of another exemplary drive circuit according to embodiments of the present disclosure. In one embodiment, the voltage stabilizing unit 40 may further include a third capacitor C3. A first electrode of the third capacitor C3 may be electrically connected to the first electrode of the first capacitor C1, and a second electrode of the third capacitor C3 may be electrically connected to the fourth signal input terminal 204. The third capacitor C3 may be configured to stabilize the potential signal of the first electrode of the first capacitor C1.

In one embodiment, it may further describe that the structure of the voltage stabilizing unit 40 of the drive circuit may include the third capacitor C3 in addition to the second capacitor C2. The first electrode of the third capacitor C3 may be electrically connected to the first electrode of the first capacitor C1, and the second electrode of the third capacitor C3 may be electrically connected to the fourth signal input terminal 204. The voltage stabilizing potential signal may be transmitted to the second electrode of the third capacitor C3 through the fourth signal input terminal 204. A certain potential difference may need to be maintained between the two electrodes of the third capacitor C3, so the first electrode of the third capacitor C3 (i.e., the first electrode of the first capacitor C1) may be maintained on the high potential signal for a period of time. In one embodiment, the third capacitor C3 may be configured to stabilize the high potential signal of the first electrode of the first capacitor C1, and signal distortion may be prevented by maintaining the stable high potential signal of the first electrode of the first capacitor C1 through the third capacitor C3.

In some optional embodiments, referring to FIG. 12, FIG. 12 illustrates a work flowchart of a drive method of a drive circuit according embodiments of the present disclosure. In one embodiment, the drive method of the drive circuit may be configured to drive the drive circuit according to the embodiments of the present disclosure. The drive method may include:

a first phase 001, where the potential signal of the third signal input terminal 203 may be transmitted to the first electrode of the first capacitor C1 through the first module 101; the potential signal of the fourth signal input terminal 204 may be transmitted to the second electrode of the first capacitor C1 through the second module 102, which may generate a voltage difference between the two electrodes of the first capacitor C1;

a second phase 002, where the potential signal of the third signal input terminal 203 may be transmitted to the second electrode of the first capacitor C1 through the third module 103, so the potential signal of the first electrode of the first capacitor C1 may be increased; and

a third phase 003, where the increased potential signal maintained by the first electrode of the first capacitor C1 may be outputted through the signal output terminal 30.

In one embodiment, it may further describe the drive method of the drive circuit according to the embodiments of the present disclosure. The drive method may at least include three working phases. In the first phase 001, the first module 101 and the second module 102 may operate, and the third module 103 may not operate, which may transmit the potential signal of the third signal input terminal 203 to the first electrode of the first capacitor C1 through the first module 101, and may transmit the potential signal of the fourth signal input terminal 204 to the second electrode of the first capacitor C1 through the second module 102, which may generate a voltage difference between the two electrodes of the first capacitor C1. In the second phase 102, the first module 101 and the second module 102 may not operate, and the third module 103 may operate, which may transmit the potential signal of the third signal input terminal 203 to the second electrode of the first capacitor C1 through the third module 103. Currently, the first module 101 may not operate, and the first capacitor C1 may be subject to the coupling effect where the voltage difference between the two electrodes of the first capacitor C1 may remain unchanged; and the potential signal of the third signal input terminal 203 may be transmitted to the second electrode of the first capacitor C1 through the third module 103. Therefore, the potential signal of the first electrode of the first capacitor C1 may be further increased. In the third phase 003, the increased potential signal maintained by the first electrode of the first capacitor C1 may be outputted through the signal output terminal 30.

In the drive method of one embodiment, the conduction and turn-off of the first module 101, the second module 102 and the third module 103 may be controlled at different time periods. Therefore, after forming the voltage difference between the first electrode and the second electrode of the first capacitor C1, the potential signal of the first electrode of the first capacitor C1 may be further increased to obtain a higher potential signal, thereby implementing the function of low voltage input and high voltage output of the drive circuit, which may be advantageous to implement the step-up drive method.

In some optional embodiments, refer to FIG. 2, FIG. 3 and FIG. 12. In one embodiment, the first module 101 may include the first transistor T1. The gate of the first transistor T1 may be electrically connected to the first signal input terminal 201. The first electrode of the first transistor T1 may be electrically connected to the third signal input terminal 203, and the second electrode of the first transistor T1 may be electrically connected to the first electrode of the first capacitor C1.

The second module 102 may include the second transistor T2. The gate of the second transistor T2 may be electrically connected to the first signal input terminal 201. The first electrode of the second transistor T2 may be electrically connected to the second electrode of the first capacitor C1, and the second electrode of the second transistor T2 may be electrically connected to the fourth signal input terminal 204.

The third module 103 may include the third transistor T3. The gate of the third transistor T3 may be electrically connected to the second signal input terminal 202. The first electrode of the third transistor T3 may be electrically connected to the second electrode of the first capacitor C1, and the second electrode of the third transistor T3 may be electrically connected to the third signal input terminal 203.

The first node N1 may be configured between the second electrode of the first transistor T1 and the first electrode of the first capacitor C1. The second node N2 may be configured between the second electrode of the first capacitor C1 and the first electrode of the second transistor T2. The first node N1 may be electrically connected to the signal output terminal 30.

In the first phase 001, both the first transistor T1 and the second transistor T2 may be conducting, and the third transistor T3 may be cutoff. The potential signal A of the third signal input terminal 203 may be transmitted to the first node N1 through the first transistor T1, and the potential signal B of the fourth signal input terminal 204 may be transmitted to the second node N2 through the second transistor T2, where A may be greater than B. The voltage difference between the two electrodes of the first capacitor C1 may be a difference (A−B) between the potential of the first node N1 and the potential of the second node N2.

In the second phase 002, the first transistor T1 and the second transistor T2 may be cutoff, and the third transistor T3 may be conducting. The potential signal A of the third signal input terminal 203 may be transmitted to the second node N2 through the third transistor T3, so the potential of the second node N2 may be A, and the potential of the first node N1 may be increased to (A+(A−B))=(2A−B).

In some optional embodiments, referring to FIG. 9, the drive circuit of the drive method may further include the voltage stabilizing unit 40. The voltage stabilizing unit 40 may be electrically connected to the fourth signal input terminal 204 and the two electrodes of the first capacitor C1 and may respectively stabilize the potential signals of the two electrodes of the first capacitor C1.

In some optional embodiments, referring to FIG. 3, FIG. 10, FIG. 11 and FIG. 13, FIG. 13 illustrates another work flowchart of a drive method of a drive circuit according embodiments of the present disclosure. In one embodiment, the voltage stabilizing unit 40 may include the second capacitor C2 and the third capacitor C3. The first electrode of the second capacitor C2 may be electrically connected to the second electrode of the first capacitor C1, and the second electrode of the second capacitor C2 may be electrically connected to the fourth signal input terminal 204. The first electrode of the third capacitor C3 may be electrically connected to the first electrode of the first capacitor C1, and the second electrode of the third capacitor C3 may be electrically connected to the fourth signal input terminal 204.

The drive method may further include a voltage stabilizing phase 004 between the second phase 002 and the third phase 003. In the voltage stabilizing phase 004, the voltage stabilizing unit 40 may stabilize the potential signals between the two electrodes of the first capacitor C1, which may maintain the increased potential signal of the first electrode of the first capacitor C1.

In the voltage stabilizing phase 004, the first transistor T1, the second transistor T2 and the third transistor T3 may all be cutoff. The potential signal of the fourth signal input terminal 204 may be transmitted to the second electrode of the second capacitor C2 and the second electrode of the third capacitor C3, which may maintain the stable potential signals of the first electrode of the second capacitor C2 and the first electrode of the third capacitor C3. The voltage difference between the first node N1 and the second node N2 may remain unchanged, that is, the potential of the first node N1 may be maintained to be (2A−B).

In one embodiment, it may further describe that the drive method of the drive circuit may further include the voltage stabilizing phase 004. In the voltage stabilizing phase 004, the voltage stabilizing unit 40 may be electrically connected to each of the fourth signal input terminal 204 and the two electrodes of the first capacitor C1, which may be configured to respectively stabilize the potential signals of the two electrodes of the first capacitor C1. After the potential signal of the first electrode of the first capacitor C1 is further increased, the potential signal may be inputted to the two electrodes of the first capacitor C1 through the fourth signal input terminal 204, so the first electrode of the first capacitor C1 may continue to maintain a high potential output, which may increase the high potential retention rate of the drive circuit.

In some optional embodiments, referring to FIG. 14 and FIG. 15, FIG. 14 illustrates a top-view structural schematic of a panel according embodiments of the present disclosure. In order to illustrate the technical solution of one embodiment, only two drive units 400 may be shown in FIG. 14 for description. A first electrode C11 of the first capacitor C1 and a second electrode C22 of the second capacitor C2 may be in a film layer structure of the panel, and may be on a side of a second electrode C12 of the first capacitor C1 and a first electrode 21 of the second capacitor C2 adjacent to a substrate 100 in FIG. 14. However, in order to illustrate other structures of the panel in FIG. 14, the first electrode C11 of the first capacitor C1 and the second electrode C22 of the second capacitor C2 may be illustrated by a dashed line box on the top-view schematic, and the actual film layer positions of the panel may be understood in conjunction with FIG. 15. FIG. 15 illustrates a cross-sectional structural schematic along a A-A′ direction in FIG. 14. In one embodiment, a panel 000 may include a substrate 100 (not filled in FIG. 15), an array layer 200, and an electrode array layer 300. The array layer 200 may be on the side of the substrate 100. The electrode array layer 300 may be on the side of the array layer 200 away from the substrate 100. The array layer 200 may include an active layer 2001, a gate metal layer M1 and a source/drain metal layer M2.

The substrate 100 may include a plurality of drive units 400 arranged in an array, a plurality of scan line groups G′, a plurality of data lines S extending in a second direction Y, and a plurality of common signal lines V extending in the second direction Y.

The scan line groups G may include first scan lines G1 and second scan lines G2 adjacent to the first scan lines G1′, extending in a first direction X, where the first direction X may be perpendicular with the second direction Y.

The electrode array layer 300 may include a plurality of drive electrodes 3001 arranged in an array (not filled in FIG. 14). The drive electrodes 3001 may correspond to the drive units 400. The drive unit 400 may include the first transistor T1, the second transistor T2, the third transistor T3, the first capacitor C1 and the second capacitor C2.

The gate of the first transistor T1 may be electrically connected to the first scan line G1. The source of the first transistor T1 may be electrically connected to the data line S. The drain of the first transistor T1 may be electrically connected to the drive electrode 3001.

The gate of the second transistor T2 may be electrically connected to the first scan line G1. The source of the second transistor T2 may be electrically connected to the common signal line V. The drain of the second transistor T2 may be electrically connected to the first electrode C21 of the second capacitor C2.

The gate of the third transistor T3 may be electrically connected to the second scan line G2. The source of the third transistor T3 may be electrically connected to the data line S. The drain of the third transistor T3 may be electrically connected to the first electrode C21 of the second capacitor C2.

The first electrode C11 of the first capacitor C1 may be electrically connected to the drive electrode 3001. The second electrode C12 of the first capacitor C1 may be electrically connected to the first electrode C21 of the second capacitor C2.

The second electrode C22 of the second capacitor C2 may be electrically connected to the common signal line V.

Optionally, in the second direction Y, the first scan line G1 and the second scan line G2 of the scan line group G may be on both sides of the drive electrode 3001. In the first direction X, the data line S and the common signal line V may be on both sides of the drive electrode 3001. Optionally, the drive electrodes 3001 may be made of a material including indium tin oxide. The first electrode C11 and the second electrode C12 of the first capacitor C1 and the first electrode C21 and the second electrode C22 of the second capacitor C2 may be made of metal materials.

The structure of the panel 000 may be provided in one embodiment. The electrode array layer 300 of the panel 000 may include the plurality of the drive electrodes 3001 arranged in an array. The drive electrodes 3001 may correspond to the drive units 400. The drive unit 400 may include the first transistor T1, the second transistor T2, the third transistor T3, the first capacitor C1 and the second transistor C2. The gate of the first transistor T1 and the gate of the second transistor T2 may both be electrically connected to the first scan line G1, which may be configured to control the conduction and cutoff of the first transistor T1 and the second transistor T2 through the scan signal provided by the first scan line G1. The gate of the third transistor T3 may be electrically connected to the second scan line G2, which may be configured to control the conduction and cutoff of the third transistor T3 through the scan signal provided by the second scan line G2. The source of the first transistor T1 may be electrically connected to the data line S, and the drain of the first transistor T1 may be electrically connected to the drive electrode 3001, which may be configured to transmit the data signal of the signal line S to the drive electrode 3001 when the first transistor T1 is conducting. The source of the second transistor T2 may be electrically connected to the data line S, and the drain of the second transistor T2 may be electrically connected to the first electrode C21 of the second capacitor C2, which may be configured to transmit the data signal of the signal line S to the first electrode C21 of the second capacitor C2 when the second transistor T2 is conducting. The source of the third transistor T3 may be electrically connected to the data line S, and the drain of the third transistor T3 may be electrically connected to the first electrode C21 of the second capacitor C2, which may be configured to transmit the data signal of the signal line S to the first electrode C21 of the second capacitor C2 when the third transistor T3 is conducting. The first electrode C11 of the first capacitor C1 may be electrically connected to the drive electrode 3001, that is, the first electrode C11 of the first capacitor C1 and the drive electrode 3001 may have the same potential signal. The second electrode C12 of the first capacitor C1 may be electrically connected to the first electrode C21 of the second capacitor C2, that is, the second electrode C12 of the first capacitor C1 and the first electrode C21 of the second capacitor C2 may have the same potential signal. The second electrode C22 of the second capacitor C2 may be electrically connected to the common signal line V. The common signal may be transmitted to the second electrode C22 of the second capacitor C2 through the common signal line V, which may maintain the stable potential of the first electrode C21 of the second capacitor C2, that is, may maintain the stable low potential of the second electrode C12 of the first capacitor C1.

It should be noted that, in one embodiment, the second electrode C22 of the second capacitor C2 may be electrically connected to the common signal line V. The common signal may be transmitted to the second electrode C22 of the second capacitor C2 through the common signal line V. An external common signal (e.g., a common signal on the drive chip) may be also transmitted to the second electrode C22 of the second capacitor C2 of each drive unit 400. The second electrode C22 of the second capacitor C2 of each drive unit 400 may be electrically connected as an integrated structure, and then may externally connected to the common signal, which may be configured according to actual situations during the implementation.

In one embodiment, the first transistor T1, the second transistor T2 and the third transistor T3 may be N-type transistors used as an example for description. First, the high potential signal of the first scan line G1 may be transmitted to the gate of the first transistor T1 and the gate of the second transistor T2. The low potential signal of the second scan line G2 may be transmitted to the gate of the third transistor T3. Currently, the first transistor T1 and the second transistor T2 may both be conducting, and the third transistor T3 may be cutoff. The potential signal of the data line S may be transmitted to the drive electrode 3001 (i.e., the first electrode C11 of the first capacitor C1) through the source and drain of the first transistor T1, and the common signal line V may transmit the common signal to the second electrode C12 of the first capacitor C1 through the source and drain of the second transistor T2. The voltage difference between the both electrodes of the first capacitor C1 may be a difference between the potential of the drive electrode 3001 and the potential of the second electrode C12 of the first capacitor C1.

Then, the low potential signal of the first scan line G1 may be transmitted to the gate of the first transistor T1 and the gate of the second transistor T2. The high potential signal of the second scan line G2 may be transmitted to the gate of the third transistor T3, so the first transistor T1 and the second transistor T2 may be cutoff and the third transistor T3 may be conducting. The potential signal of the data line S may be transmitted to the second electrode C12 of the first capacitor C1 through the source and drain of the third transistor T3. Currently, the first transistor T1 may be cutoff and the first capacitor C1 may be subject to the coupling effect where the voltage difference between the two electrodes of the first capacitor C1 may be maintained unchanged, so the potential (i.e., the potential of the drive electrode 3001) of the first electrode C11 of the first capacitor C1 may be further increased.

Then, the low potential signal of the first scan line G1 and the low potential signal of the second scan line G2 may be transmitted to the gate of the first transistor T1, the gate of the second transistor T2 and the gate of the third transistor T3, so the first transistor T1, the second transistor T2 and the third transistor T3 may all be cutoff. The common signal may be transmitted to the second electrode C22 of the second capacitor C2 through the common signal line V, which may maintain the low potential of the first electrode C21 of the second capacitor C2 (i.e., the second electrode C12 of the first capacitor C1). Therefore, the high potential signal of the first electrode C11 of the first capacitor C1 (i.e., the drive electrode 3001) may be maintained and the signal distortion may be prevented, thereby implementing the potential signal increase of the drive electrode 3001 of the panel 000 and improving the drive capability.

It should be noted that, in one embodiment, only the film layer structure of the panel 000 related to the technical content of the present disclosure may be illustrated in FIG. 15 for description, which may not be limited to the film layer structure. Other film layers such as an insulation layer, a flat layer, etc. may be included in FIG. 15, which may not be described in detail herein. Those skilled in the art may understand the panel structure of the present disclosure according to the film layer structure of the existing panel. In one embodiment, the electrode array layer 300 may be made of a transparent conductive material, such as indium tin oxide (ITO) semiconductor transparent conductive material, and also be made of other transparent conductive materials which may not be limited in the embodiments of the present disclosure.

In some optional embodiments, referring to FIG. 14 and FIG. 15, one common signal line V may be configured between every two data lines S, and one data line S may be configured between every two common signal lines V.

The first scan line G1 and the second scan line G2 of one scan line group G may be respectively between two adjacent drive units 400 in the second direction Y.

One first scan line G1 and one second scan line G2 on the both sides of the drive unit 400 in the second direction Y, and one data line S and one common signal line V on the both sides of the drive unit 400 in the first direction X may insulatively intersect to define the region for the drive unit 400.

In one embodiment, it may further describe that the relative positional relationship between each drive unit 400, the scan line group G, the data line S and the common signal line V on the panel 000. In such way, the scan line group G, the data line S and the common signal line V may provide different drive signals, which may enable the reasonable structure arrangement of the panel 000 and may better implement the drive function of the drive unit 400 in one embodiment.

In some optional embodiments, referring to FIG. 14 and FIG. 15, the drain of the first transistor T1 may be electrically connected to the drive electrode 3001 through a first via 500, and the first electrode C11 of the first capacitor C1 may be electrically connected to the drive electrode 3001 through a second via 600.

In one embodiment, the drain of the first transistor T1 may be electrically connected to the drive electrode 3001 through the first via 500, and the first electrode C11 of the first capacitor C1 may be electrically connected to the drive electrode 3001 through the second via 600. The drive voltage of the drive electrode 3001 may be provided by the drain of the first transistor T1 and the first electrode C11 of the first capacitor C1, which may implement the step-up effect of low voltage input and high voltage output of the drive unit 400.

In some optional embodiments, referring to FIG. 14 and FIG. 15, the scan line group G, the gate of the first transistor T1, the gate of the second transistor T2 and the gate of the third transistor T3 may all in the gate metal layer M1. The data line S, the common signal line V, the source and drain of the first transistor T1, the source and drain of the second transistor T2, and the source and drain of the third transistor T3 may all in the source/drain metal layer M2.

The first electrode C11 of the first capacitor C1 may be in the gate metal layer M1 and the electrode array layer 300, and the second electrode C12 of the first capacitor C1 may be in the source/drain metal layer M2.

The first electrode C21 of the second capacitor C2 may be in the source/drain metal layer M2, and the second electrode C22 of the second capacitor C2 may be in the gate metal layer M1.

In one embodiment, it may further describe that the film layer of each structure of the drive unit 400 on the panel. Therefore, the first capacitor C1 may be formed by overlapping the gate metal layer M1 and the source/drain metal layer M2, and by overlapping the source/drain metal layer M2 and the electrode array layer 300, and the second capacitor C2 may be formed by overlapping the source/drain metal layer M2 and the gate metal layer M1, which may effectively improve the capacitance of the first capacitor C1 when the second capacitor C2 is formed simultaneously.

It should be noted that, in one embodiment, the drain of the first transistor T1 and the second electrode C12 of the first capacitor C1 may be both in the source/drain metal layer M2. However, the drain of the first transistor T1 may be electrically connected to the drive electrode 3001 through the first via 500, and the drive electrode 3001 may be electrically connected to the first electrode C11 of the first capacitor C1 through the second via 600. Therefore, in order to form the first capacitor C1 by overlapping the gate metal layer M1 and the source/drain metal layer M2 and by overlapping the source/drain metal layer M2 and the electrode array layer 300, the drain of the first transistor T1 and the second electrode C12 of the first capacitor C1 may be two separate structures (as shown in FIG. 15).

In some optional embodiments, referring to FIG. 14 and FIG. 16, FIG. 16 illustrates another cross-sectional structural schematic along a B-B′ direction in FIG. 14. In one embodiment, the drive unit 400 may further include the fourth transistor T4 and the fifth transistor T5. The gate of the fourth transistor T4 may be electrically connected to the gate of the second transistor T2. The drain of the fourth transistor T4 may be electrically connected to the source of the second transistor T2. The source of the fourth transistor T4 may be electrically connected to the common signal line V. The gate of the fifth transistor T5 may be electrically connected to the gate of the third transistor T3. The drain of the fifth transistor T5 may be electrically connected to the source of the third transistor T3. The source of the fifth transistor T5 may be electrically connected to the data signal line S.

The gate of the fourth transistor T4 and the gate of the fifth transistor T5 may both in the gate metal layer M1. The source and drain of the fourth transistor T4, and the source and drain of the fifth transistor T5 may all in the source/drain metal layer M2.

The drain of the fourth transistor T4 and the source of the second transistor T2 may be formed into an integrated structure, and the drain of the fifth transistor T5 and the source of the third transistor T3 may be formed into an integrated structure.

In one embodiment, it may further describe that the second transistor T2 of the drive unit 400 may be electrically connected to the fourth transistor T4, and the third transistor T3 may be electrically connected to the fifth transistor T5. The drain of the fourth transistor T4 and the source of the second transistor T2 may be an integrated structure, and the drain of the fifth transistor T5 and the source of the third transistor T3 may be an integrated structure. Therefore, the second transistor T2 and the fourth transistor T4 may form a switch transistor with a double channel structure, and the third transistor T3 and the fifth transistor T5 may also form a switch transistor with a double channel structure. When the data line S of the drive unit 400 supplies the potential signal to the second electrode C12 of the first capacitor C1 through the fifth transistor T5 and the third transistor T3, a current flowing through the fifth transistor T5 is assumed as I, so a leakage current flowing through the gate of the fifth transistor T5 may be A % X I. When the leakage current A % X I flows through the gate of the third transistor T3, the leakage current may be A % X I X A %. If A takes a constant of 10, the leakage current flowing through the gate of the fifth transistor T5 may be 10% I. When flowing through the gate of the third transistor T3, the leakage current may be 10% X I X 10%=1% I. Compared with the gate with only one third transistor T3, the leakage current of the gate with the fifth transistor T5 and the third transistor T3 may be reduced by 9% I when transmitting to the second electrode C12 of the first capacitor C1. Similarly, the common signal line V may supply the potential signal to the second electrode C12 of the first capacitor C1 through the fourth transistor T4 and the second transistor T2, which may also reduce the leakage current correspondingly. In the drive unit 400 of one embodiment, the second transistor T2 may be electrically connected to the fourth transistor T4, and the third transistor T3 may be electrically connected to the fifth transistor T5. Moreover, the drain of the fourth transistor T4 and the source of the second transistor T2 may be an integrated structure, and the drain of the fifth transistor T5 and the source of the third transistor T3 may be an integrated structure, which may reduce the leakage current and improve the stability of the output signal of the drive unit 400.

In some optional embodiments, referring to FIG. 14 and FIG. 15, the second electrode C12 of the first capacitor C1 and the first electrode C21 of the second capacitor C2 may be an integrated structure.

In one embodiment, it may further describe that the second electrode C12 of the first capacitor C1 and the first electrode C21 of the second capacitor C2 may be an integrated structure. The second electrode C12 of the first capacitor C1 and the first electrode C21 of the second capacitor C2 may both in the source/drain metal layer M2, so the both electrodes may be configured as an integrated structure during the process, which may enable the second electrode C12 of the first electrode C1 and the first electrode C21 of the second capacitor C2 to be connected to a same potential signal, and may also simplify the process, save process time and improve process efficiency.

In some optional embodiments, referring to FIG. 14 and FIG. 17, FIG. 17 illustrates another top-view structural schematic of a panel according embodiments of the present disclosure. In one embodiment, the shape orthographically projected on the substrate 100 from the drive electrode 3001 may be one of a semicircle, a square, a hexagon, an octagon, a rectangle, and a crescent.

In one embodiment, it may further describe the configured structural shape of the drive electrode 3001. As shown in FIG. 14, the shape orthographically projected on the substrate 100 from the drive electrode 3001 may be a square, or one of other shapes such as a semicircle (not shown), a hexagon, a octagon (shown in FIG. 17), a rectangle (not shown) and a crescent (not shown), and may not be limited to the shapes listed in one embodiment. The shape may be one of other shapes, which may only meet the following requirement: the drive electrode 3001 may be a transparent conductive material and may cover the entire drive unit 400, so each drive unit 400 may correspond to each drive electrode 3001 and the drive unit 400 may provide the drive signal to the drive electrode 3001, which may not be described in detail in one embodiment.

In some optional embodiments, FIG. 18 illustrates another top-view structural schematic of a panel according embodiments of the present disclosure (in order to illustrate the technical solution of one embodiment, only a portion of the drive electrode 3001 of the panel 000 may be shown in FIG. 18 for description). In one embodiment, a distance range L between the adjacent drive electrodes 3001 may be about 10 μm to about 1000 μm.

In one embodiment, it may further describe the positional relationship between the plurality of the drive electrodes 3001 arranged in an array included in the electrode array layer 300 in the direction parallel to the base 100. The distance range L between the adjacent drive electrodes 3001 may be about 10 μm to about 1000 μm. Therefore, the distance between the adjacent drive electrodes 3001 may not be too large, which may make the electric field formed between the adjacent drive electrodes to be weak and reduce the drive capacity of the panel 000. It may further avoid the space waste of the panel 000 and also avoid the short circuit due to the small distance between the adjacent drive electrodes 3001, thereby avoiding the crosstalk of the drive signal. In one embodiment, by defining the distance L between the adjacent drive electrodes 3001, the drive capacity of the panel 000 may be improved and the pass rate of the panel 00 may be further improved.

In some optional embodiments, referring to FIGS. 14-21, FIG. 19 illustrates another top-view structural schematic of a panel according embodiments of the present disclosure. FIG. 20 illustrates a drive sequence schematic corresponding to a first drive unit 4001 in FIG. 22. FIG. 21 illustrates a drive sequence schematic corresponding to a second drive unit 4002 in FIG. 19. A drive method of the panel 000 may be provided in one embodiment. The panel may be the panel 000 according to the above-mentioned embodiments. The panel 000 may include the plurality of the drive units 400 arranged in an array. The drive method may include that an electric field may be formed between adjacent drive electrodes 3001 on the panel 000 by modifying the potential signal received by the data line S of the two adjacent drive units 400. For example, the panel 000 may include the first drive unit 4001 and the second drive unit 4002 adjacent to the first drive unit 4001 arranged in the second direction Y sequentially. The electric field may be formed between the first drive unit 4001 and the second drive unit 4002. As shown in the time period a in FIG. 20 and FIG. 21, for the first drive unit 4001 and the second drive unit 4002, the first scan lines G1 may receive the enable signal and the second scan lines G2 may not receive the enable signal (it should be noted that, when all the transistors in the drive units are N-type transistors, the enable signal received may be the high potential signal which may enable the transistors to be conducting; when all the transistors in the drive units are P-type transistors, the enable signal connected may need to be the low potential signal which may enable the transistors to be conducting; and the transistors which all are N-type may be used as an example for description in FIG. 20 and FIG. 21), which may make the first transistor T1 and the second transistor T2 to be conducting, and make the third transistor T3 to be cutoff. The low potential signal may be transmitted to the data line S of the first drive unit 4001; the high potential signal may be transmitted to the data line S of the second drive unit 4002; the low potential signal may be transmitted to the common signal line V of the first drive unit 4001; and the low potential signal may be transmitted to the common signal line V of the second drive unit 4002. In such way, the potential of the first electrode C11 (the first electrode C11 of the first capacitor C1 may be electrically connected to the drive electrode 3001, so the potential signal of the first electrode C11 of the first capacitor C1 of the first drive unit 4001 in FIG. 19 may be the potential signal of the drive electrode of the first drive unit 4001) of the first capacitor C1 of the first drive unit 4001 may be the low potential signal, and the potential of the second electrode C12 of the first capacitor C1 may be the low potential signal. In addition, the potential of the first electrode C11 (the first electrode C11 of the first capacitor C1 may be electrically connected to the drive electrode 3001, so the potential signal of the first electrode C11 of the first capacitor C1 of the second drive unit 4002 in FIG. 19 may be the potential signal of the drive electrode of the second drive unit 4002) of the first capacitor C1 of the second drive unit 4002 may be the high potential signal, and the potential of the second electrode C12 of the first capacitor C1 may be the low potential signal. Therefore, the potential of the drive electrode 3001 of the first drive unit 4001 may be lower than the potential of the drive electrode 3001 of the second drive unit 4002.

As shown in the time period b in FIG. 20 and FIG. 21, for the first drive unit 4001 and the second drive unit 4002, the first scan lines G1 may disconnect the enable signal and the second scan lines G2 may receive the enable signal, which may make the first transistor T1 and the second transistor T2 to be cutoff and make the third transistor T3 to be conducting. The low potential signal may continue to be transmitted to the data line S of the first drive unit 4001 and also the common signal line V of the first drive unit 4001; the high potential signal may continue to be transmitted to the data line S of the second drive unit 4002; and the low potential signal may continue to be transmitted to the common signal line V of the second drive unit 4002. In such way, the potential of the first electrode C11 of the first capacitor C1 of the second drive unit 4002 (the first electrode C11 of the first capacitor C1 may be electrically connected to the drive electrode 3001, so the potential signal of the first electrode C11 of the first capacitor C1 of the second drive unit 4002 in FIG. 19 may be the potential signal of the drive electrode of the second drive unit 4002) may be further increased due to the coupling effect. Therefore, the potential of the drive electrode 3001 of the first drive unit 4001 may be further lower than the potential of the drive electrode 3001 of the second drive unit 4002.

In one embodiment, the two adjacent drive units 400 (the first drive unit 4001 and the second drive unit 4002) in combination with the corresponding drive sequences may be described, including how to make the potential of the drive electrode 3001 of the first drive unit 4001 lower than the potential of the drive electrode 3001 of the second drive unit 4002, and further increase the potential of the drive electrode 3001 of the second drive unit 4002, which may make a larger potential difference of the drive electrodes of the two adjacent drive units 400. In one embodiment, the panel 000 may be applied to the microfluidic chip based on the dielectric electrowetting technique, and an electric field may be formed by the potential difference between adjacent drive units 400, thereby generating a pressure difference and an asymmetrical deformation inside the liquid droplet by the electric field, and further driving the liquid droplet to move in an directional manner. Optionally, referring to FIG. 22, FIG. 22 illustrates a cross-sectional structural schematic along a C-C′ direction in FIG. 19 (in order to illustrate the technical solution of one embodiment, only a portion of the film layer structure of the panel 000 may be shown in the cross-sectional view of FIG. 22 for description, and the other portions of the film layer structure of the panel may be understood in conjunction with FIG. 15 and FIG. 16). An insulating hydrophobic layer 700 may be also included at the side of the electrode array layer 300 of the panel away from the substrate 100. A microfluidic channel layer 800 (not filled in FIG. 22) may be also included at the side of the insulating hydrophobic layer 700 away from the substrate 100 and may be used for the movement of a liquid droplet 900. The drive method of the panel provided in one embodiment may make the potential difference between the two adjacent drive units 400 to be sufficiently large, so a relatively high drive voltage may be provided to move the liquid droplet 900 normally.

It should be noted that, in one embodiment, the liquid droplet 900 may be a liquid having conductivity and may include a biological sample or a chemical substance composed of a single component or a plurality of components. In one embodiment, the liquid droplet 900 may be negative charged as an example, and the liquid droplet 900 may move in the opposite direction of the electric field line. As an example, the panel 000 may be applied to the microfluidic chip that may require a relatively large drive voltage in one embodiment, which may not be limited to the application scenario. The panel 000 may also be applied to other structures that may require a high voltage drive, which may not be limited in one embodiment.

In some optional embodiments, referring to FIGS. 19-22, a difference range of the potential signal between the drive electrodes 3001 corresponding to the two adjacent drive units 400 may be about 30 V to about 60 V.

In one embodiment, it may further describe that the normal drive voltage required for moving the liquid droplet may be affected by a variety of manufacturing process factors when the panel 000 is applied to the microfluidic chip based on the dielectric electro-wetting technique. Each chip may have a normal drive threshold, and the liquid droplet may be distorted or moved when the voltage value on the adjacent drive electrodes 3001 is greater than or equal to the drive threshold. Therefore, the difference range of the potential signals between the drive electrodes 3001 corresponding to the two adjacent drive units 400 may be defined as about 30 V to about 60 V in one embodiment, which may move the liquid droplet normally on the panel 000.

In some optional embodiments, referring to FIGS. 19-22, before forming the electric field between the first drive unit 4001 and the second drive unit 4002, the method may further need to confirm positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field.

In one embodiment, it may further describe that, before forming the electric field between the first drive unit 4001 and the second drive unit 4002, the positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field, may be confirmed. Therefore, different high or low potential signals may be respectively provided to the data lines S of the first drive unit 4001 and the second drive unit 4002 through the position determination, and the electric field may be formed between the first drive unit 4001 and the second drive unit 4002. If the drive units 400 at other positions have no drive tasks, the data line S may not provide the potential signal, which may be advantageous to save resources and improve work efficiency.

In some optional embodiments, referring to FIG. 23, FIG. 23 illustrates a principle structural schematic of confirming positions of the first drive unit 4001 and the second drive unit 4002 according embodiments of the present disclosure. In one embodiment, the positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field, may be confirmed.

For example, the first drive unit 4001 may correspond to the first drive electrode 30011, and the second drive unit 4002 may be correspond to the second drive electrode 30012.

A first auxiliary electrode 30021 may be disposed on the side of the first drive electrode 30011, and a second auxiliary electrode 30022 may be disposed on the side of the second drive electrode 30012. The panel may include a detection chip 1100 which may be electrically connected to each of the first auxiliary electrode 30021, the second auxiliary electrode 30022, the first drive electrode 30011 and the second drive electrode 30012 respectively.

The first drive electrode 30011 and the first auxiliary electrode 30021 may form a first detection capacitor C1′, and the second drive electrode 30012 and the second auxiliary electrode 30022 may form a second detection capacitor C2′. The positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field, may be confirmed according to different detection signals received by the detection chip 1100.

In some optional embodiments, the panel 000 of the above-mentioned embodiments may be applied to the microfluidic chip. When the area of each drive unit 400 is sufficiently large and the moving path of the liquid droplet 900 in the microfluidic channel layer 800 is visible to human eyes, the positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field, may be confirmed by human eyes. That is, the current position of the drive unit 40 where the liquid droplet 90 may be located and the position of the drive unit 40 which the liquid droplet 90 may need to be moved to may be confirmed by human eyes. However, in other optional embodiments, the moving path of the liquid droplet 900 in the microfluidic channel layer 800 may not be visible to human eyes. For example, the panel 000 may has a large number of the drive units 400, resulting a small area of each drive unit 400; or a cover (not shown in FIG. 22) of the panel 000 may be disposed on the side of the microfluidic channel layer 800 away from the substrate 100, and the cover and the substrate 100 may form a sealed box. Therefore, the positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field, may not be confirmed by human eyes.

In one embodiment, the first auxiliary electrode 30021 may be disposed on the side of the first drive electrode 30011 and the second auxiliary electrode 30022 may be disposed on the side of the second drive electrode 30012. In addition, the panel may be disposed with the detection chip 1100, which may be electrically connected to each of the first auxiliary electrode 30021, the second auxiliary electrode 30022, the first drive electrode 30011 and the second drive electrode 30012 respectively. In such way, the positions of the first drive unit 4001 and the second drive unit 4002 may be determined. The first auxiliary electrode 30021 and the second auxiliary electrode 30022 may be configured as the detection input terminal, so the potential signal may be transmitted to the first drive electrode 30011 and the second drive electrode 30012 through the drive unit 400. However, the first auxiliary electrode 30021 and the second auxiliary electrode 30022 may transmit the high or low potential signals different from the first drive electrode 30011 and the second drive electrode 30012 through the detection chip 1100. In such way, the first drive electrode 30011 and the first auxiliary electrode 30021 may form the first detection capacitor C1′, and the second drive electrode 30012 and the second auxiliary electrode 30022 may form the second detection capacitor C2′. The position of the liquid droplet may be determined according to the different capacitance value detected by the detection chip 1100, and the positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field, may be further confirmed. That is, the current position of the drive unit 400 where the liquid droplet 900 may be located and the position of the next drive unit 400 which the liquid droplet 900 may need to be moved to may be confirmed. Depending on whether the liquid droplet 900 reaches the position of a certain drive unit 400, the detection capacitance values between the drive electrode 3001 and the auxiliary electrode at the position may be different. Therefore, the positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field, may be confirmed according the values of the first detection capacitance C1′ and the second detection capacitance C2′.

In some optional embodiments, the drive method of the panel may further include sequentially providing signals to the scan line group G. Before conforming the positions of the first drive unit 4001 and the second drive unit 4002 which are required for forming the electric field, the low potential signal may be provided to the data line S.

In one embodiment, the drive method of the panel may further include sequentially providing signals to the scan line group G. Before conforming the positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field, the low potential signal may be provided to the data line S. The low potential signal may be supplied through the data line S, which may make each potential signal of the drive electrode of each drive unit 400 to be the low potential signal, so a signal initialization may be performed on the drive unit of the panel. Then, when confirming the positions of the first drive unit 4001 and the second drive unit 4002, which are required for forming the electric field, the interference of the signal of other drive units 400 may be avoided.

From the above-mentioned embodiments, it can be seen that the display panel and the display device provided by the present disclosure may achieve at least the following beneficial effects.

The drive circuit provided by the present disclosure may transmit the signal of the third signal input terminal to the first electrode of the first capacitor through the first module, and may transmit the signal of the fourth signal input terminal to the second electrode of the first capacitor through the second module, which may generate the voltage difference between the first electrode and the second electrode of the first capacitor. Then, the signal of the third signal input terminal may be transmitted to the second electrode of the first capacitor through the third module. Currently, the first module may not operate, and the first capacitor may be subject to the coupling effect where a voltage difference between the two electrodes of the first capacitor may remain unchanged; and also the signal of the third signal input terminal may be transmitted to the second electrode of the first capacitor through the third module. Therefore, the signal of the first electrode of the first capacitor may be further increased. In one embodiment, the conduction and turn-off of the first module, the second module and the third module may be controlled at different time periods. Therefore, after forming the voltage difference between the first electrode and the second electrode of the first capacitor, the potential signal of the first electrode of the first capacitor may be further increased to obtain a higher potential signal, thereby implementing the function of low voltage input and high voltage output of the drive circuit, which may be advantageous to implement the step-up drive circuit. Moreover, the drive circuit provided in one embodiment may be applied to the microfluidic device, and the drive chip providing the drive signal may not need to be configured with a large number of signal channels when the microfluidic device needs a large number of drive electrodes to simultaneously perform chemical micro-reactions or substance detections of large quantities of samples, which may be advantageous to reduce the computational difficulty of the drive chips, and to provide a sufficiently high drive voltage for moving the liquid droplets normally.

The details of the present disclosure have been described through the embodiments provided above. However, those skilled in the art should understand that the disclosed embodiments are exemplary only and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the disclosed embodiments can be modified according to the scope and principles of the present disclosure. The scope of the present disclosure is defined by the appended claims and their equivalents. 

What is claimed is:
 1. A drive circuit, comprising: a step-up unit, a plurality of signal input terminals and a signal output terminal, electrically connected with each other, wherein: the step-up unit includes a first module, a second module, a third module and a first capacitor, electrically connected with each other; the plurality of signal input terminals includes a first signal input terminal, a second signal input terminal, a third signal input terminal and a fourth signal input terminal; the first module is electrically connected to each of the first signal input terminal, the third signal input terminal, and a first electrode of the first capacitor; and the first module is configured to transmit a signal of the third signal input terminal to the first electrode of the first capacitor; the second module is electrically connected to each of a second electrode of the first capacitor, the first signal input terminal and the fourth signal input terminal; and the second module is configured to transmit a signal of the fourth signal input terminal to the second electrode of the first capacitor; and the third module is electrically connected to each of the second signal input terminal, the third signal input terminal and the second electrode of the first capacitor; and the third module is configured to transmit the signal of the third signal input terminal to the second electrode of the first capacitor to further increase the signal of the first electrode of the first capacitor; and the first electrode of the first capacitor is electrically connected to the signal output terminal to output a high potential signal.
 2. The drive circuit according to claim 1, wherein: the first module includes a first transistor, wherein a gate of the first transistor is electrically connected to the first signal input terminal; a first electrode of the first transistor is electrically connected to the third signal input terminal; and a second electrode of the first transistor is electrically connected to the first electrode of the first capacitor; the second module includes a second transistor, wherein a gate of the second transistor is electrically connected to the first signal input terminal; a first electrode of the second transistor is electrically connected to the second electrode of the first capacitor; and a second electrode of the second transistor is electrically connected to the fourth signal input terminal; the third module includes a third transistor, wherein a gate of the third transistor is electrically connected to the second signal input terminal; a first electrode of the third transistor is electrically connected to the second electrode of the first capacitor; and a second electrode of the third transistor is electrically connected to the third signal input terminal; and a first node is configured between the second electrode of the first transistor and the first electrode of the first capacitor; a second node is configured between the second electrode of the first capacitor and the first electrode of the second transistor; and the first node is electrically connected to the signal output terminal.
 3. The drive circuit according to claim 2, wherein: the second module further includes a fourth transistor, wherein a gate of the fourth transistor is electrically connected to the gate of the second transistor; a first electrode of the fourth transistor is electrically connected to the second electrode of the second transistor; and a second electrode of the fourth transistor is electrically connected to the fourth signal input terminal; and the third module further includes a fifth transistor, wherein a gate of the fifth transistor is electrically connected to the gate of the third transistor; a first electrode of the fifth transistor is electrically connected to the second electrode of the third transistor; and a second electrode of the fifth transistor is electrically connected to the third signal input terminal.
 4. The drive circuit according to claim 2, wherein: each of the first transistor, the second transistor and the third transistor is a P-type transistor or a N-type transistor.
 5. The drive circuit according to claim 1, further including a voltage stabilizing unit, wherein: the voltage stabilizing unit is electrically connected to each of the fourth signal input terminal and two electrodes of the first capacitor; and the voltage stabilizing unit is configured to respectively stabilize potential signals of the two electrodes of the first capacitor.
 6. The drive circuit according to claim 5, wherein: the voltage stabilizing unit includes a second capacitor, wherein a first electrode of the second capacitor is electrically connected to the second electrode of the first capacitor; a second electrode of the second capacitor is electrically connected to the fourth signal input terminal; and the second capacitor is configured to stabilize the potential signal of the second electrode of the first capacitor.
 7. The drive circuit according to claim 6, wherein: the voltage stabilizing unit further includes a third capacitor, wherein a first electrode of the third capacitor is electrically connected to the first electrode of the first capacitor; a second electrode of the third capacitor is electrically connected to the fourth signal input terminal; and the third capacitor is configured to stabilize the potential signal of the first electrode of the first capacitor.
 8. A drive method of a drive circuit, configured to drive the drive circuit of claim 1, the method comprising: a first phase, wherein a potential signal of the third signal input terminal is transmitted to the first electrode of the first capacitor through the first module, and a potential signal of the fourth signal input terminal is transmitted to the second electrode of the first capacitor through the second module, thereby generating a voltage difference between two electrodes of the first capacitor; a second phase, wherein the potential signal of the third signal input terminal is transmitted to the second electrode of the first capacitor through the third module, thereby increasing the potential signal of the first electrode of the first capacitor; and a third phase, wherein the increased potential signal maintained by the first electrode of the first capacitor is outputted through the signal output terminal.
 9. The drive method according to claim 8, wherein: the first module includes a first transistor, wherein a gate of the first transistor is electrically connected to the first signal input terminal; a first electrode of the first transistor is electrically connected to the third signal input terminal; and a second electrode of the first transistor is electrically connected to the first electrode of the first capacitor; the second module includes a second transistor, wherein a gate of the second transistor is electrically connected to the first signal input terminal; a first electrode of the second transistor is electrically connected to the second electrode of the first capacitor; and a second electrode of the second transistor is electrically connected to the fourth signal input terminal; the third module includes a third transistor, wherein a gate of the third transistor is electrically connected to the second signal input terminal; a first electrode of the third transistor is electrically connected to the second electrode of the first capacitor; and a second electrode of the third transistor is electrically connected to the third signal input terminal; a first node is configured between the second electrode of the first transistor and the first electrode of the first capacitor; a second node is configured between the second electrode of the first capacitor and the first electrode of the second transistor; and the first node is electrically connected to the signal output terminal; and in the first phase, the first transistor and the second transistor are both conducting, and the third transistor is cutoff; a potential signal A of the third signal input terminal is transmitted to the first node through the first transistor, and a potential signal B of the fourth signal input terminal is transmitted to the second node through the second transistor, wherein A is greater than B; and a voltage difference between the two electrodes of the first capacitor is a difference (A−B) between a potential of the first node and a potential of the second node.
 10. The drive method according to claim 9, wherein: in the second phase, the first transistor and the second transistor are both cutoff, and the third transistor is conducting; the potential signal A of the third signal input terminal is transmitted to the second node through the third transistor, thereby providing the second node with the potential signal A; and the potential of the first node is increased to (A+(A−B))=(2A−B).
 11. The drive method according to claim 10, wherein: the drive circuit further includes a voltage stabilizing unit; the voltage stabilizing unit is electrically connected to each of the fourth signal input terminal and the two electrodes of the first capacitor; and the voltage stabilizing unit is configured to respectively stabilize potential signals of the two electrodes of the first capacitor.
 12. The drive method according to claim 11, wherein: the voltage stabilizing unit includes a second capacitor and a third capacitor; a first electrode of the second capacitor is electrically connected to the second electrode of the first capacitor; a second electrode of the second capacitor is electrically connected to the fourth signal input terminal; a first electrode of the third capacitor is electrically connected to the first electrode of the first capacitor; and a second electrode of the second capacitor is electrically connected to the fourth signal input terminal; and the drive method further includes a voltage stabilizing phase between the second phase and the third phase; and the voltage stabilizing unit stabilizes the potential signals between the two electrodes of the first capacitor in the voltage stabilizing phase, which maintains the increased potential signal of the first electrode of the first capacitor.
 13. The drive method according to claim 12, wherein: in the voltage stabilizing phase, the first transistor, the second transistor and the third transistor are cutoff; the potential signal of the fourth signal input terminal is transmitted to the second electrode of the second capacitor and the second electrode of the third capacitor, thereby maintaining the stable potential signals of the first electrode of the second capacitor and the first electrode of the third capacitor; and a voltage difference between the first node and the second node remains unchanged, and the potential of the first node is maintained to be (2A−B). 